God of War 3 looks pretty good although not played the full game. I really like the look of Uncharted 2 because they have some great level design and nice bright colors. DiRT 2 also looks good on PS3 although it overuses HDR / Bloom
LA Noire looks really nice, though graphics don't play as big a part in my choosing of a game.
And for all those games that have terrible pallets of grey/browns, (you gears of war), and the over use of bloom effects as stated in some games. It's kind of like the shaky cam that became so big in films, it's great when used the first time and to great effect (Saving Private Ryan), but then you get amateurs throwing it in to look cool. Kind of like bullet time has become.... how the hell did we survive without that game mechanic for so long?